2007-02-07 Paolo Bonzini <bonzini@gnu.org>

[bison.git] / src / symtab.h

diff --git a/src/symtab.h b/src/symtab.h
index 00770a6e24807fbea6c3eb27db14d48cadbb9de9..7a25b360a747890e3418d2c276cefff8a9e46471 100644 (file)
--- a/src/symtab.h
+++ b/src/symtab.h
@@ -1,6 +1,6 @@
 /* Definitions for symtab.c and callers, part of Bison.
 
-   Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002, 2004, 2005, 2006
+   Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002, 2004, 2005, 2006, 2007
    Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
@@ -30,6 +30,7 @@
 
 # include "assoc.h"
 # include "location.h"
+# include "scan-code.h"
 # include "uniqstr.h"
 
 /*----------.
@@ -61,17 +62,24 @@ struct symbol
   /** The location of its first occurrence.  */
   location location;
 
-  /** Its %type and associated printer and destructor.  */
+  /** Its \c \%type.  */
   uniqstr type_name;
+  /** Its \c \%type's location.  */
   location type_location;
 
-  /** Does not own the memory. */
-  const char *destructor;
-  location destructor_location;
+  /** Any \c \%destructor declared specifically for this symbol.
 
-  /** Printer. */
-  const char *printer;
-  location printer_location;
+     Access this field only through <tt>symbol</tt>'s interface functions.  For
+     example, if <tt>symbol::destructor = NULL</tt>, a default \c \%destructor
+     or a per-type \c \%destructor might be appropriate, and
+     \c symbol_destructor_get will compute the correct one.  */
+  code_props destructor;
+
+  /** Any \c \%printer declared specifically for this symbol.
+
+     Access this field only through <tt>symbol</tt>'s interface functions.
+     \sa symbol::destructor  */
+  code_props printer;
 
   symbol_number number;
   location prec_location;
@@ -87,7 +95,6 @@ struct symbol
   bool declared;
 };
 
-
 /** Undefined user number.  */
 #define USER_NUMBER_UNDEFINED -1
 
@@ -114,6 +121,9 @@ symbol *symbol_get (const char *key, location loc);
    Its name cannot conflict with the user's names.  */
 symbol *dummy_symbol_get (location loc);
 
+/** Is this a dummy nonterminal?  */
+bool symbol_is_dummy (const symbol *sym);
+
 /** Declare the new symbol \c sym.  Make it an alias of \c symval.  */
 void symbol_make_alias (symbol *sym, symbol *symval, location loc);
 
@@ -123,10 +133,18 @@ void symbol_make_alias (symbol *sym, symbol *symval, location loc);
 void symbol_type_set (symbol *sym, uniqstr type_name, location loc);
 
 /** Set the \c destructor associated with \c sym.  */
-void symbol_destructor_set (symbol *sym, const char *destructor, location loc);
+void symbol_destructor_set (symbol *sym, code_props const *destructor);
+
+/** Get the computed \c \%destructor for \c sym, which was initialized with
+    \c code_props_none_init if there's no \c \%destructor.  */
+code_props const *symbol_destructor_get (symbol const *sym);
 
 /** Set the \c printer associated with \c sym.  */
-void symbol_printer_set (symbol *sym, const char *printer, location loc);
+void symbol_printer_set (symbol *sym, code_props const *printer);
+
+/** Get the computed \c \%printer for \c sym, which was initialized with
+    \c code_props_none_init if there's no \c \%printer.  */
+code_props const *symbol_printer_get (symbol const *sym);
 
 /* Set the \c precedence associated with \c sym.
 
@@ -155,19 +173,50 @@ extern symbol *accept;
 
 /** The user start symbol. */
 extern symbol *startsymbol;
-/** The location of the \c %start declaration.  */
+/** The location of the \c \%start declaration.  */
 extern location startsymbol_location;
 
 
-/*---------------.
-| Symbol table.  |
-`---------------*/
+/*-----------------.
+| Semantic types.  |
+`-----------------*/
+
+/** A semantic type and its associated \c \%destructor and \c \%printer.
+
+   Access the fields of this struct only through the interface functions in
+   this file.  \sa symbol::destructor  */
+typedef struct {
+  /** The key, name of the semantic type.  */
+  uniqstr tag;
+
+  /** Any \c %destructor declared for this semantic type.  */
+  code_props destructor;
+  /** Any \c %printer declared for this semantic type.  */
+  code_props printer;
+} semantic_type;
+
+/** Fetch (or create) the semantic type associated to KEY.  */
+semantic_type *semantic_type_from_uniqstr (const uniqstr key);
+
+/** Fetch (or create) the semantic type associated to KEY.  */
+semantic_type *semantic_type_get (const char *key);
+
+/** Set the \c destructor associated with \c type.  */
+void semantic_type_destructor_set (semantic_type *type,
+                                   code_props const *destructor);
+
+/** Set the \c printer associated with \c type.  */
+void semantic_type_printer_set (semantic_type *type,
+                                code_props const *printer);
 
+/*----------------------------------.
+| Symbol and semantic type tables.  |
+`----------------------------------*/
 
-/** Create the symbol table.  */
+/** Create the symbol and semantic type tables.  */
 void symbols_new (void);
 
-/** Free all the memory allocated for symbols.  */
+/** Free all the memory allocated for symbols and semantic types.  */
 void symbols_free (void);
 
 /** Check that all the symbols are defined.
@@ -181,4 +230,19 @@ void symbols_check_defined (void);
    #token_translations.  */
 void symbols_pack (void);
 
+
+/*---------------------------------------.
+| Default %destructor's and %printer's.  |
+`---------------------------------------*/
+
+/** Set the default \c \%destructor for tagged values.  */
+void default_tagged_destructor_set (code_props const *destructor);
+/** Set the default \c \%destructor for tagless values.  */
+void default_tagless_destructor_set (code_props const *destructor);
+
+/** Set the default \c \%printer for tagged values.  */
+void default_tagged_printer_set (code_props const *printer);
+/** Set the default \c \%printer for tagless values.  */
+void default_tagless_printer_set (code_props const *printer);
+
 #endif /* !SYMTAB_H_ */